1. Pehle tay kariye: kya dhoondhna hai?
Coins aur jewellery, gold nuggets, gehraai mein dabi badi dhaatu, ya security checking. Har kaam ke liye alag machine behtar hoti hai. Ek “sab kuch karne wali” machine aksar kisi ek kaam mein kamzor hoti hai.
2. Technology chuniye
- VLF (Very Low Frequency): Coins, relics aur jewellery ke liye. Target ID se lohe aur achhi dhaatu ka fark batati hai.
- Multi-frequency: Ek saath kai frequencies. Mixed mitti aur beach par sabse versatile.
- PI (Pulse Induction): Mineral wali mitti aur gehraai ke liye sabse achhi. Gold prospecting mein pasand ki jaati hai, lekin discrimination kam hota hai.
3. Frequency ka matlab
Kam frequency (5–8 kHz) badi aur gehri dhaatu, khaaskar silver aur copper, ke liye achhi hai. Zyada frequency (18–45 kHz se upar) chhote gold aur patli jewellery par zyada sensitive hoti hai.
4. Coil ka size
Chhota coil (6–8 inch): kachre wali jagah mein target alag karna aasaan. Medium (10–11 inch): all-round. Bada coil (15 inch ya zyada): zyada gehraai aur area, lekin chhote target miss ho sakte hain.
5. Ground balance zaroori hai
Rajasthan, Karnataka aur Jharkhand jaisi jagahon ki mitti mein iron mineral zyada hote hain. Bina sahi ground balance ke detector baar baar galat beep deta hai. Automatic ya manual ground balance wali machine lijiye.
6. Jhoothe daavon se bachiye
“Long range locator” ya “1000 metre tak sona” jaise daave wale kai device vigyan ke hisaab se kaam nahi karte. Asli metal detector ki gehraai coil ke size se judi hoti hai: coin size target ke liye aam taur par 20–60 cm, aur badi dhaatu ke liye bade coil se 1–3 metre tak.
7. Service aur parts
Detector kitna bhi achha ho, kabhi na kabhi coil, battery ya cable badalni padti hai. Aisi company se lijiye jo India mein repair aur parts de sake.
Confuse hain? Apna kaam aur budget humein bhejiye, hum seedhi salah denge.